Waveguide structure

Claim 2

A waveguide structure comprising: a waveguide section having longitudinally extending conductive walls defining a waveguiding aperture adapted for the propagation of electromagnetic waves therealong over a given range of frequencies in a longitudinal direction, a reflecting member located at one terminating end of said waveguide section, said reflecting member having an elongated aperture and a pair of reflecting surfaces bordering opposite elongated sides of said elongated aperture, said elongated aperture being located so that an extension of the center line of said waveguide section passes through said elongated aperture and between said reflecting surfaces, the width of said elongated aperture and the length of said reflecting surfaces along the said longitudinal direction being determined so that upon the applIcation of electromagnetic waves to said waveguide, no appreciable radiation exits from said elongated aperture in the reflecting member.

Claim 3

A waveguide structure, comprising in combination: a waveguide section having longitudinally extending conductive walls defining a waveguiding aperture adapted for the propagation of electromagnetic waves over a given range of radio frequencies in a longitudinal direction, a radio frequency reflecting member closing off the said waveguide aperture of said waveguide section at one terminating end thereof, said member having an elongated aperture therein which beginning at the center line of the waveguide section extends toward the opposite conductive walls of the waveguide section, said member presenting at the border of said elongated aperture a pair of reflecting surfaces extending in said longitudinal direction, the width of said elongated aperture and the longitudinal length of said reflected surfaces being arranged so that upon the application of said waves to said waveguide section an effective short is provided by said reflecting member and no appreciable radiation occurs through said elongated aperture.

Claim 4

A waveguide structure, comprising in combination: a waveguide section having longitudinally extending conductive walls defining a waveguiding aperture adapted for the propagation of electromagnetic waves over a given range of radio frequencies in a longitudinal direction, a radio frequency reflecting member closing off the said waveguide aperture of said waveguide section at one terminating end thereof, said member having an elongated aperture therein which beginning at the center line of the waveguide section extends toward the opposite conductive walls of the waveguide section, said member presenting at the border of said elongated aperture a pair of reflecting surfaces extending in said longitudinal direction, the width of said elongated aperture and the longitudinal length of said reflected surfaces being arranged so that upon the application of said waves to said waveguide section an effective short is provided by said reflecting member and no appreciable radiation occurs through said elongated aperture.

Claim 5

The combination claimed in claim 2 wherein said waveguide section is a rectangular waveguide having broad walls and narrow walls and said elongated aperture extends to the opposite broad walls.

Claim 6

An effectively closed-end waveguide structure comprising in combination: a rectangular waveguide section adapted for operation over a given range of frequencies, a pair of conductive plates closely spaced to each other at one end of said waveguide section so as to leave a narrow gap therebetween, said narrow gap being centered midway between the narrow walls of the waveguide, the spacing between said plates and thickness of said plates being arranged so that upon the application of signals over said given range of frequencies to said waveguide, no appreciable radiation exits from said waveguide at said end.

Claim 7

An effectively closed-end waveguide structure comprising in combination: a rectangular waveguide section adapted for operation over a given range of frequencies, a pair of conductive plates closely spaced to each other at one end of said waveguide section so as to leave a narrow gap therebetween, said narrow gap being centered midway between the narrow walls of the waveguide, the spacing between said plates and thickness of said plates being arranged so that upon the application of signals over said given range of frequencies to said waveguide, no appreciable radiation exits from said waveguide at said end.

Claim 8

The combination claimed in claim 4 wherein said spacing between said plates is substantially less that one-half wavelength at the highest operating frequency of said waveguide and said thickness of said plates is at least about equal to said spacing.

Claim 9

A waveguide to microstrip transition structure comprising in combination: a rectangular waveguide section adapted for operation over a given range of frequencies, a pair of conductive end plates closely spaced to each other at one end of said waveguide section, the region between the plates being located midway between the narrow walls of said waveguide section, said region extending between the broad walls of said waveguide section, said waveguide section having an elongated central aperture in each of the broad walls communicating with said region and extending from said one end into said waveguide section a distance approximately equal to one-quarter wavelength at a frequency within said given range of frequencies, a ground planar conductor having an aperture adapted to receive therein said waveguide section, said waveguide section being positioned in said ground conductor aperture with said one end of said waveguide section approximately one-quarter wavelength from said ground conductor at a frequency within said given range of frequencies, said ground conductor being electrically connected to the walls of said waveguide section, a dielectric slab having an elongated narrow strip-like conductor on one surface thereof, said slab being fixed to said ground planar conductor to form a microstrip transmission line therewith, a portion of said dielectric slab and said narrow strip-like conductor extending through one of said elongated central apertures into said waveguide section in a manner to act as an electric field coupling device in said waveguide section.

Claim 10

A waveguide to microstrip transition structure comprising in combination: a rectangular waveguide section adapted for operation over a given range of frequencies, a pair of conductive end plates closely spaced to each other at one end of said waveguide section, the region between the plates being located midway between the narrow walls of said waveguide section, said region extending between the broad walls of said waveguide section, said waveguide section having an elongated central aperture in each of the broad walls communicating with said region and extending from said one end into said waveguide section a distance approximately equal to one-quarter wavelength at a frequency within said given range of frequencies, a ground planar conductor having an aperture adapted to receive therein said waveguide section, said waveguide section being positioned in said ground conductor aperture with said one end of said waveguide section approximately one-quarter wavelength from said ground conductor at a frequency within said given range of frequencies, said ground conductor being electrically connected to the walls of said waveguide section, a dielectric slab having an elongated narrow strip-like conductor on one surface thereof, said slab being fixed to said ground planar conductor to form a microstrip transmission line therewith, a portion of said dielectric slab and said narrow strip-like conductor extending through one of said elongated central apertures into said waveguide section in a manner to act as an electric field coupling device in said waveguide section.